Test `overwrite_existing` apparent symlink dereferencing #6152

Job	Run time
pure-rust-build	2m 3s
test	11m 58s
test-fast (ubuntu-latest)	2m 58s
check-packetline (ubuntu-latest)	6s
test-fast (macos-latest)	2m 55s
test-fast (windows-latest)	12m 18s
test-fixtures-windows	14m 49s
test-journey	3m 53s
test-32bit (arm32v7)	4m 22s
test-32bit-windows-size-doc	6m 4s
test-fast (ubuntu-24.04-arm)	2m 59s
WebAssembly (wasm32-unknown-unknown)	1m 9s
cargo-deny-advisories	31s
WebAssembly (wasm32-wasip1)	45s
test-ext4-casefold (2, A)	4m 12s
cargo-deny	33s
test-ext4-casefold (2, C)	1m 58s
test-32bit (i386)	5m 47s
test-ext4-casefold (2, B)	2m 9s
test-ext4-casefold (3, D)	3m 29s
test-ext4-casefold (1, E)	6m 4s
check-blocking	5s
test-ext4-casefold (3, A)	3m 28s
test-ext4-casefold (2, D)	4m 7s
test-ext4-casefold (1, F)	5m 51s
test-ext4-casefold (4, C)	2m 6s
test-ext4-casefold (1, C)	5m 56s
test-ext4-casefold (4, B)	3m 17s
test-ext4-casefold (3, F)	3m 33s
test-ext4-casefold (3, G)	3m 35s
test-ext4-casefold (2, E)	4m 9s
test-ext4-casefold (1, B)	6m 3s
test-ext4-casefold (1, G)	5m 55s
test-ext4-casefold (4, F)	3m 16s
test-ext4-casefold (4, E)	3m 15s
lint	1m 12s
test-ext4-casefold (1, A)	6m 14s
test-ext4-casefold (2, G)	4m 7s
test-ext4-casefold (2, F)	1m 59s
test-ext4-casefold (1, D)	6m 6s
test-ext4-casefold (4, D)	3m 16s
test-ext4-casefold (3, C)	3m 29s
test-ext4-casefold (4, A)	2m 8s
test-ext4-casefold (3, B)	3m 29s
test-ext4-casefold (4, G)	3m 16s
test-ext4-casefold (3, E)	3m 35s
Tests pass	3s
	3h 4m 32s

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